Improvement in air-traps for steam and other enginery



V e. w. BLAKE.-

Air Trap for Steam-Heater.

No. 92,571. Patented July 13, 1869.

lllllllll hitched $21M fiat-tent Gtjijiire.

GEORGE l/V. BLAKE,

OF NEW YORK, N. Y.-

Letters PateatliTo. 92,571, dated July 13, 1869.

IMPROVEMENT IN .AIR TRAPS FOR STEAM AND OTHER EIN'G-INERY.

To all whom it may concern:

Be it known that I, GEORGE W. BLAKE, of the city, county, and State of New York, have invented a new and useful Improvement in Air-Traps for Radiators, of which the following is a full, clear, and exact,

description,reference being had to the accompanying drawing, forming part of this specification, and in which-- Figure 1 represents an outside longitudinal view of an air-trap shaft, with its valvular attachment;

Figure 2 is -a' longitudinal section of the same; and

Figure 3, a longitudinal view of the valve box or plug detached, with the valve arranged therein.

Similar letters of reference indicate corresponding parts.

My improvement has reference to air-traps, as applied to steam-radiators for admitting air to the interior of the radiator, to fill up the void therein, on the steam being shut voti" or radiator cooling down, and to allow oi the expulsion of the air from the radiator, on admitting steam thereto, but preventing the escape of steam therefi'om,1through the trap, after the air has been expelled and a certain amount of heat imparted to the radiator.

The invention consists in a certain combination and arrangement of a three-leaved buckling-spring, trapshaft in whichthe same is enclosed, and valve closed by said spring, against the pressure of a spring applied to OpQlLSZlld valve, whereby simplicity of construction isjcombined with efliciency of action.

Also, the invention consists in an advantageous and novel construction of the valve-box or plug to the trap. Referringto the accompanying drawing it represents the air-trap shaft, which may be screwed at its lower end a into the top, or othelyconvenient part of the radiator. Within this shaft is arianged, in a-loose or free manner, a buckling-spring, Bf, allowed to rest on a screw, 11, or other suitable support, and of a three-leaved character, being made up of a central or intermediate steel strip, 0, and outside strips 11 (1, formed of brass, all riveted together orunited at their ends, so that on sufficient heat being imparted to the radiator by the admission of steam thereto, said spring, by the difference in the expansive properties of the metals of which it is composed, will be caused to buckle, or its outer leaves to bow, and

K by their pressure against the backof the shaft and on the valve 0, to close the latter. But, on the radiator cooling down and a tendency to the formation of a vacuum therein being produced by shutting 0d the steam, said spring, by the contraction of the metals of which it is composed, will exert a straight eningaction of the outer leaves (I d, and so allow the valve. 0 to open and admit air to the radiator'to fill up the .void, by the pressure of a spring, 0, applied to said valve, which remains open for the expulsion of air on again admitting steam to the radiator, and until the spring is once more buckled or bowed by the heat.

The box or plug D, which carries the valve, instead of being screwed into the mouth or'outer end of the teat or nozzle E of the shaft A, is made simply to but, by its flange j, against the outer end of said nozzle, or'suitable packing applied thereto, and the inner end 9 of such plug or valve-box made to screw into thehack end of the nozzle or side of the air-shaft.

By this mode of constructing and, fitting the plug which is of a hollow character between.its portions f and g, and has side openings h h in it for establishing communication with the aperture 3, through which the airis admitted and expelled, a shorter nozzle is'rendered necessary, and I am enabled'to arrange a cavity, m, around the body of the plug, for, in connection with the openings h h, the collection of water passing through the valve, and discharge of the same into or out through the aperture 3, .or pipe connected there- .with.

. What is here claimed, and desired to be secured by Letters Patent, is'- 1. The combination of the tln-ee-leaved bucklingspring 13, air-shaft A, valve 0, and opening-springc, all constructed and arranged substantially as shown and described, for the purpose set forth. -2. The valve-box or plug D, resting by its flange. f

against the outer end of the nozzle E, and screwing at its inner end g into the back of the nozzle, in combination with the cavity at formed around the hollow portion of saithplug, and openings It made in the sides of the latter, substantially as shown and described.

' GEO. WV. BLAKE.

Witnesses:

F. HAYnns, J. W. OooMBs. 

